Sequential AC-DC load flow method for two-terminal HVDC networks (Version 2.1)

A HVDC load flow algorithm in Simulink treated separately from an AC load flow in SimPowerSystems.

This demo illustrates a sequential AC-DC load flow method involving iteration between DC and AC solutions.
The AC load flow is performed by the load flow tool of the Powergui. The DC load flow solution is computed running a simulation using the HVDC Link Steady-State block that represents the HVDC Link in steady-state operation. It is now possible (but not demonstrated here) to include a second HVDC link in the network.
A script controls the whole process and iterates until the convergence criteria for the AC and DC load flows have been reached simultaneously. The parameters used by the script are defined in the block Sequential Load Flow Param embedded in the network model LF_AC29bus_HVDCdemo_V2_1.slx.The load flows results are printed in report file(s) specified by the user. To execute the script, open the model and click “Compute” in the block Sequential Load Flow Para. Open the Demo Info block to get a description of the AC-DC network as well as info on the sequential method.
This solution technique can be extended to any number of HVDC links connected inside the same AC system or between isolated AC systems